diff --git a/World-properties.md b/World-properties.md
index f6d8679..fb473ff 100644
--- a/World-properties.md
+++ b/World-properties.md
@@ -456,6 +456,9 @@ Multiverse allows you to control whether or not users are allowed to create port
 
 Allow portal forming must be `NONE`, `ALL`, `NETHER` or `END`.
 
+__Type__
+`String`
+
 __Example__: 
 `portalform: ALL`